Quasi-Z-source three-phase voltage source inverter with virtual space vector modulation to increase the voltage gain and reduction of common mode voltage
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PhD Research Scholar, IIEST, Shibpur
Indian Institute of Engineering Science and Technology, Shibpur, India
Corresponding author
Debalina Nanda   

PhD Research Scholar, IIEST, Shibpur
Power Electronics and Drives 2024;9 (44)
A Quasi-Z-source network is used to boost the dc bus voltage of a voltage source two levels H-bridge inverter to increase the voltage gain. With the increase in the dc bus voltage, the common mode voltage also increases. The common mode voltage is reduced using virtual space vector pulse width modulation. Due to the presence of a Quasi-Z-source network, the expression of the common mode voltage changes significantly with respect to the conventional voltage source two-level H-bridge inverter fed from a pure dc supply. In this paper, a detailed analysis of the origin of the common mode voltage for the Quasi-Z-source two-level H-bridge inverter is presented. Additionally, it is shown how the common mode voltage is affected for a dc input supply taken from a three-phase diode bridge rectifier. The work also details the scheme for suitable placement of shoot-through time intervals required for boosting within the non-active time intervals in virtual space vector pulse width modulation. The simulation and experimental results show the scheme is effective in increasing the voltage gain and reducing the common mode voltage arising at the third harmonic of the desired output frequency by at least 33.33%.
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